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O'Reilly Network: BSD DevCenter: Introduction to OpenBSD Networking

n today's Internet-centric computing world, networking
components are a paramount feature of any system worth its salt.
Easily falling into that category, OpenBSD contains strong network
code and configuration interfaces which, with a little research and
learning, can be put to powerful use. This series of articles aims
to illustrate that with practical examples and direct application
to real-world situations."

"In contrast to its sysv counterparts like Linux, OpenBSD has a
very different way of controlling network interfaces and setting
parameters. Other competing systems commonly use menu-based or
graphical configuration utilities to make the administrator's life
easier. OpenBSD chooses to stray from this, instead focusing their
efforts on the functionality and correctness of its networking
components. The example being used here is the setup of a gateway
machine with one PPP interface and one Ethernet interface."

"The first thing you'll want to do when configuring an
OpenBSD machine to participate on a network is set basic parameters
on the network interfaces...."